The Exo, developed by Reaction Housing, aims to revolutionise disaster response. Its founder, Michael McDaniel, was inspired after seeing the poor quality shelters thousands were forced to use after hurricane Katrina hit the United States in 2005.

Exo units can be stacked on top of each other like Styrofoam cups to allow them to be transported in large numbers. A cargo ship could transport 300,000 units – enough to house more than 1 million people.